Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
See detailLe montage comme réponse moderne à la crise du sens
Hagelstein, Maud ULg; Hamers, Jérémy ULg

Scientific conference (2013, April 24)

Notre idée est ici de repartir de la conjoncture moderne pour étudier sous un angle renouvelé le problème du montage (à partir des textes de Kracauer, notamment) – problème qui nous semble déboucher sur ... [more ▼]

Notre idée est ici de repartir de la conjoncture moderne pour étudier sous un angle renouvelé le problème du montage (à partir des textes de Kracauer, notamment) – problème qui nous semble déboucher sur des enjeux politiques et esthétiques toujours actuels (que l’on tentera d’éclairer au fur et à mesure de l’exposé à travers quelques cas précis). Le débat autour du montage semble atteindre son maximum de vivacité dans les années 1920 (aussi bien dans les milieux intellectuels que dans les milieux artistiques). À cette époque, suite aux transformations amenées par l’essor de la société industrielle (sur le plan axiologique, sociologique ou technologique), suite à la première Guerre mondiale surtout et au déchaînement de la violence sur les individus, l’homme moderne se dépeint fréquemment sur le mode de celui qui, ayant perdu l’essentiel de ses repères, et déstabilisé dans ses croyances, se voit contraint à errer dans un monde désenchanté qu’il ne reconnaît plus. Or, ces mêmes années sont aussi celles qui voient se développer toutes sortes d’avant-gardes artistiques pour lesquelles l’opération du montage constitue un outil primordial. [less ▲]

Detailed reference viewed: 38 (4 ULg)
Full Text
See detailMontage de projets de Recherche et d’Innovation : A la recherche de financements
Hiligsmann, Serge ULg

Scientific conference (2014, October 23)

Detailed reference viewed: 28 (1 ULg)
See detailMontage du premier télescope auxiliaire de l'interféromètre du VLT à Paranal (Chili)
Jehin, Emmanuel ULg

Article for general public (2004)

Detailed reference viewed: 13 (0 ULg)
Full Text
See detailMontage et gestion budgétaire
Van Caillie, Didier ULg; Marthoz, Cédric

Learning material (2004)

This seminar overviews key elements that are necessary to plan and to budget new projects. An application is realized in the context of an international cooperation project.

Detailed reference viewed: 76 (8 ULg)
Full Text
Peer Reviewed
See detailMontage et résistance du réel chez S. Kracauer : Photographie, cinéma, texte
Hagelstein, Maud ULg; Hamers, Jérémy ULg

in Bulletin d'Analyse Phénoménologique (2016), 12 (2016)(4),

En tant que témoin et acteur des vifs débats sur le montage qui marquent l’Europe artistique et intellectuelle de l’après-guerre, Kracauer rédige dans les années 1920 une série de « feuilletons » sur la ... [more ▼]

En tant que témoin et acteur des vifs débats sur le montage qui marquent l’Europe artistique et intellectuelle de l’après-guerre, Kracauer rédige dans les années 1920 une série de « feuilletons » sur la modernité weimarienne repris dans L’Ornement de la masse (1963). Un texte en particulier retiendra ici notre attention qui permet de poser, en dehors des analyses vouées au cinéma, la question du montage. Ce texte, « Le Hall d’hôtel », est extrait d’un ouvrage sur le roman policier non publié à l’époque. Il vise à énoncer le problème du sens dans une société où la religion s’effondre progressivement. Selon Kracauer, la production artistique est toute entière prise dans cette vocation de solutionner la perte de sens consécutive à la modernité. Comme il l’évoque en des termes apparemment naïfs, plus le monde se déréalise, plus l’art doit exercer son rôle d’éducateur2. Là où le monde est devenu muet, là où son sens général s’est obscurci, la forme esthétique peut encore produire selon Kracauer une « sorte de langage ». L’art permet en effet d’exprimer à nouveaux frais les relations existant entre des éléments décousus et « reposant les uns à côté des autres en ordre dispersé ». Vecteur d’une sortie de l’état désenchanté du monde moderne, l’éducateur se définit par conséquent chez Kracauer comme celui qui relie entre eux des éléments épars. Et l’artiste devient bien un tel éducateur lorsqu’il vise, à travers un « organisme esthétique », une totalité qui permet de ressaisir les « éléments d’un monde en décomposition dispersés à l’aveuglette »3. Or, dans ce texte de jeunesse déjà, Kracauer introduit une nuance : car si le rôle de l’artiste est déterminant dans sa tentative de résoudre le désenchantement du monde, il risque aussi de s’engager sur la voie néfaste qui consisterait à ré-enchanter le monde de manière abusive. Face à ces éléments dispersés qu’il s’agit de réorganiser, l’artiste peut soit être un véritable éducateur-voyant et restituer avec justesse les liens entre les éléments (il est alors du côté du « bon » montage qui respecte la réalité), soit construire un monde totalement artificiel, potentiellement enclin à donner une idée fausse de la réalité, voire idéologiquement trompeuse, en somme une sorte de « mauvais » montage. Kracauer se méfiera jusqu’à la fin de sa vie de ce montage-là, sans cependant jamais définir précisément le « principe de réalité » auquel s’adosse la normativité établie par lui comme fondement de toute l’esthétique matérielle. [less ▲]

Detailed reference viewed: 22 (1 ULg)
Full Text
Peer Reviewed
See detailMontage et résistance du réel chez S. Kracauer: Photographie, cinéma, texte.
Hagelstein, Maud ULg; Hamers, Jérémy ULg

in Bulletin d'Analyse Phénoménologique (in press)

Partant de quelques textes dans lesquels S. Kracauer traite du rapport entre montage et réel, cet article tente de préciser et de problématiser l’ambivalence de Kracauer à l’égard de l’outil « montage » ... [more ▼]

Partant de quelques textes dans lesquels S. Kracauer traite du rapport entre montage et réel, cet article tente de préciser et de problématiser l’ambivalence de Kracauer à l’égard de l’outil « montage », notamment dans le champ cinématographique, en ouvrant la réflexion par cette double question : comment définir un « mauvais usage » du montage et, à l’opposé, comment peuvent se mettre en place les conditions d’un « bon usage » du montage selon Kracauer ? Pour y répondre, les auteurs identifient d'abord, dans l’œuvre de Kracauer, les éléments explicites et implicites (montage textuel) qui permettent de saisir au plus près ce que serait, selon le philosophe et sociologue, le principe de réalité. Ensuite, une œuvre photographique, contemporaine des quelques textes évoqués, Menschen des 20. Jahrhunderts d’August Sander, permet de mieux circonscrire les possibles concrétisations de cette pensée en la mettant à l’épreuve d’une réalisation en images et en montage. [less ▲]

Detailed reference viewed: 85 (10 ULg)
See detailMontages critiques
Hamers, Jérémy ULg; Hagelstein, Maud ULg

Scientific conference (2013, March 15)

Detailed reference viewed: 29 (2 ULg)
See detailMontages poétiques, montages critiques : Sur l'exposition "Atlas. Comment porter le monde sur ses épaules?"
Hagelstein, Maud ULg

Article for general public (2011)

Atlas. À la fois le nom d’un Titan révolté contre les dieux et la solution à un problème central de la théorie de l’image. Dans l’exposition madrilène orchestrée par Georges Didi-Huberman, celui qui fût ... [more ▼]

Atlas. À la fois le nom d’un Titan révolté contre les dieux et la solution à un problème central de la théorie de l’image. Dans l’exposition madrilène orchestrée par Georges Didi-Huberman, celui qui fût condamné par Zeus à « porter le monde sur ses épaules » sert de paradigme pour les opérations novatrices par lesquelles la culture visuelle parvient à s’exposer. L’atlas devient ainsi le nom générique pour toute une série de stratégies de présentation de documents visuels. Dans les salles du musée Reina Sofia, on trouve des atlas multiformes cherchant à cartographier le réel à partir d’objets aussi différents que des raz-de-marée (Susan Hiller), des châteaux d’eau (Berndt & Hilla Becher), des désastres (Goya), des morceaux de lave (Roni Horn) ou des courants de fumée (Etienne-Jules Marey). Autant de collections organisées, autant de constellations d’images. L’exposition défie le spectateur de saisir les logiques subversives à l’origine de ces montages incongrus (plusieurs plans, plusieurs éléments, plusieurs images… Pour dire quoi ?). Les atlas font fourmiller les ressemblances, mais aussi les contrastes. Il n’est donc pas facile de voir ce qui relie ces assemblages. [less ▲]

Detailed reference viewed: 65 (2 ULg)
Full Text
Peer Reviewed
See detailLes montants affectés aux cultes et à la laïcité
Husson, Jean-François ULg

in Sägesser, Caroline; Schreiber, Jean-Philippe (Eds.) Le financement public des religions et de la laïcité en Belgique (2010)

This chapter analyses the various channels through which religious and philosophical communities are financed by public autthorities in Belgium.

Detailed reference viewed: 104 (19 ULg)
See detailMonte Bianco eterno
Frison-Roche, Roger; Colonel, Fabien; Benzoni, Pietro ULg

Book published by Rizzoli (2002)

Detailed reference viewed: 25 (2 ULg)
Full Text
See detailA Monte Carlo Analysis of the VAR-Based Indirect Inference Estimation of DSGE Models
Dubois, David ULg

E-print/Working paper (2011)

In this paper we study estimation of DSGE models. More specifically, in the indirect inference framework, we analyze how critical is the choice of the reduced form model for estimation purposes. As it ... [more ▼]

In this paper we study estimation of DSGE models. More specifically, in the indirect inference framework, we analyze how critical is the choice of the reduced form model for estimation purposes. As it turns out, simple VAR parameters performs better than commonly used impulse response functions. This can be attributed to the fact that IRF worsen identifica- tion issues for models that are already plagued by that phenomenon. [less ▲]

Detailed reference viewed: 43 (1 ULg)
Full Text
Peer Reviewed
See detailA Monte Carlo model of auroral hydrogen emission line profiles
Gérard, Jean-Claude ULg; Shematovich, V. I.; Bisikalo, D. V. et al

in Annales Geophysicae (2005), 23

Hydrogen line profiles measured from space-borne or ground-based instruments provide useful information to study the physical processes occurring in the proton aurora and to estimate the proton flux ... [more ▼]

Hydrogen line profiles measured from space-borne or ground-based instruments provide useful information to study the physical processes occurring in the proton aurora and to estimate the proton flux characteristics. The line shape of the hydrogen lines is determined by the velocity distribution of H atoms along the line-of-sight of the instrument. Calculations of line profiles of auroral hydrogen emissions were obtained using a Monte Carlo kinetic model of proton precipitation into the auroral atmosphere. In this model both processes of energy degradation and scattering angle redistribution in momentum and charge transfer collisions of the high-energy proton/hydrogen flux with the ambient atmospheric gas are considered at the microphysical level. The model is based on measured cross sections and scattering angle distributions and on a stochastic interpretation of such collisions. Calculations show that collisional angular redistribution of the precipitating proton/hydrogen beam is the dominant process leading to the formation of extended wings and peak shifts in the hydrogen line profiles. All simulations produce a peak shift from the rest line wavelength decreasing with increasing proton energy. These model predictions are confirmed by analysis of ground-based H-beta line observations from Poker Flat, showing an anti-correlation between the magnitude of the peak shift and the extent of the blue wing of the line. Our results also strongly suggest that the relative extension of the blue and red wings provides a much better indicator of the auroral proton characteristic energy than the position of the peak wavelength. [less ▲]

Detailed reference viewed: 23 (3 ULg)
Full Text
Peer Reviewed
See detailMonte Carlo model of electron transport for the calculation of Mars dayglow emissions
Shematovich, V. I.; Bisikalo, D. V.; Gérard, Jean-Claude ULg et al

in Journal of Geophysical Research. Planets (2008), 113

A model of the photoelectron collision-induced component of the Mars dayglow using recent cross sections and solar flux is described. The calculation of the photoelectron source of excitation is based on ... [more ▼]

A model of the photoelectron collision-induced component of the Mars dayglow using recent cross sections and solar flux is described. The calculation of the photoelectron source of excitation is based on a stochastic solution of the Boltzmann equation using the direct simulation Monte Carlo method. The neutral atmosphere is taken from outputs of a global circulation model, and recent inelastic collision cross sections are adopted. The calculated vertical profiles of the CO Cameron bands and CO[SUB]2[/SUB] [SUP]+[/SUP] doublet emissions integrated along the line of sight compare well with the Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) limb profiles observed with the SPICAM spectrograph on board Mars Express made at Ls = 166° during the summer season at northern midlatitudes. The comparison shows agreement to within the uncertainties of the excitation cross sections. Seasonal changes in the brightness and the altitude of the emission peaks are predicted with intensity variations in the range 15-20%. [less ▲]

Detailed reference viewed: 16 (10 ULg)
See detailMonte Carlo modelling in Positron Emission Tomography
Taleb, Dounia ULg

Scientific conference (2011, February 04)

Gate (Geant4 Application for Tomographic Emission), based on Monte Carlo methods allows simulation of full PET-acquisition processes. Gate results for one of CRC’s tomographs, the HR+, are in good ... [more ▼]

Gate (Geant4 Application for Tomographic Emission), based on Monte Carlo methods allows simulation of full PET-acquisition processes. Gate results for one of CRC’s tomographs, the HR+, are in good agreement with real data, with a maximum mean difference of 6%. Monte Carlo simulations are highly CPU-consuming, so we had to parallelize simulations on the recently setup cluster. In order to use Gate properly on the cluster, the optimal number of CPU was determined. We studied the performances of the small animal microPET FOCUS 120 in terms of counting rate capability (NECR index) for comparison with future simulated results. [less ▲]

Detailed reference viewed: 55 (3 ULg)
Full Text
Peer Reviewed
See detailMonte Carlo search algorithm discovery for single-player games
Maes, Francis; Lupien St-Pierre, David ULg; Ernst, Damien ULg

in IEEE Transactions on Computational Intelligence and AI in Games (2013), 5(3), 201-213

Much current research in AI and games is being devoted to Monte Carlo search (MCS) algorithms. While the quest for a single unified MCS algorithm that would perform well on all problems is of major ... [more ▼]

Much current research in AI and games is being devoted to Monte Carlo search (MCS) algorithms. While the quest for a single unified MCS algorithm that would perform well on all problems is of major interest for AI, practitioners often know in advance the problem they want to solve, and spend plenty of time exploiting this knowledge to customize their MCS algorithm in a problem-driven way. We propose an MCS algorithm discovery scheme to perform this in an automatic and reproducible way. We first introduce a grammar over MCS algorithms that enables inducing a rich space of candidate algorithms. Afterwards, we search in this space for the algorithm that performs best on average for a given distribution of training problems. We rely on multi-armed bandits to approximately solve this optimization problem. The experiments, generated on three different domains, show that our approach enables discovering algorithms that outperform several well-known MCS algorithms such as Upper Confidence bounds applied to Trees and Nested Monte Carlo search. We also show that the discovered algorithms are generally quite robust with respect to changes in the distribution over the training problems. [less ▲]

Detailed reference viewed: 314 (30 ULg)
Full Text
Peer Reviewed
See detailMonte Carlo Simulation of Metastable Oxygen Photochemistry in Cometary Atmospheres
Bisikalo, D. V.; Shematovich, V. I.; Gérard, Jean-Claude ULg et al

in Astrophysical Journal (2015), 798

Cometary atmospheres are produced by the outgassing of material, mainly H[SUB]2[/SUB]O, CO, and CO[SUB]2[/SUB] from the nucleus of the comet under the energy input from the Sun. Subsequent photochemical ... [more ▼]

Cometary atmospheres are produced by the outgassing of material, mainly H[SUB]2[/SUB]O, CO, and CO[SUB]2[/SUB] from the nucleus of the comet under the energy input from the Sun. Subsequent photochemical processes lead to the production of other species generally absent from the nucleus, such as OH. Although all comets are different, they all have a highly rarefied atmosphere, which is an ideal environment for nonthermal photochemical processes to take place and influence the detailed state of the atmosphere. We develop a Monte Carlo model of the coma photochemistry. We compute the energy distribution functions (EDF) of the metastable O([SUP]1[/SUP]D) and O([SUP]1[/SUP]S) species and obtain the red (630 nm) and green (557.7 nm) spectral line shapes of the full coma, consistent with the computed EDFs and the expansion velocity. We show that both species have a severely non-Maxwellian EDF, that results in broad spectral lines and the suprathermal broadening dominates due to the expansion motion. We apply our model to the atmosphere of comet C/1996 B2 (Hyakutake) and 103P/Hartley 2. The computed width of the green line, expressed in terms of speed, is lower than that of the red line. This result is comparable to previous theoretical analyses, but in disagreement with observations. We explain that the spectral line shape does not only depend on the exothermicity of the photochemical production mechanisms, but also on thermalization, due to elastic collisions, reducing the width of the emission line coming from the O([SUP]1[/SUP]D) level, which has a longer lifetime. [less ▲]

Detailed reference viewed: 22 (5 ULg)
Peer Reviewed
See detailMonte Carlo Simulations of Autorotative Dynamics of a Simple Tower Crane Model
Vanvinckenroye, Hélène ULg; Denoël, Vincent ULg

in Proceedings of the 14th International Conference on Wind Engineering (2015)

The increasing number of crane accidents recorded over the last years might be understood as a need for progress on crane modeling. The induced risk of self-excited vibrations has already been ... [more ▼]

The increasing number of crane accidents recorded over the last years might be understood as a need for progress on crane modeling. The induced risk of self-excited vibrations has already been investigated through numerous experiments. This work presents a simple numerical model of a crane in a turbulent wind field, in order to support the available experimental approaches. First, the problem is defined with the necessary assumptions of the model. Second, the equation of motion is developed and wind characteristics are detailed. This equation presents several specificities requiring dedicated resolution methods. In a first analysis, the crane model is simplified in order to approach the behavior of the parametric pendulum and enable a general comparison of both responses. Indeed, the parametric pendulum is a well-known problem that is already widely described in the literature. In a second step, the response of the crane is studied under a realistic stochastic wind load with the full model. [less ▲]

Detailed reference viewed: 57 (14 ULg)
Full Text
Peer Reviewed
See detailMonte Carlo simulations of the dose from imaging with GE eXplore 120 micro-CT using gate.
Bretin, Florian; Bahri, Mohamed Ali ULg; Luxen, André ULg et al

in Medical Physics (2015), 42(10), 5711-5719

Purpose: Small animals are increasingly used as translational models in preclinical imaging studies, during which the subjects can be exposed to large amounts of radiation. While the radiation levels are ... [more ▼]

Purpose: Small animals are increasingly used as translational models in preclinical imaging studies, during which the subjects can be exposed to large amounts of radiation. While the radiation levels are generally sublethal, studies have shown that low-level radiation can change physiological parameters in mice. In order to rule out any influence of radiation on the outcome of such experiments, or resulting deterministic effects in the subjects, the levels of radiation involved need to be addressed. The aim of this study was to investigate the radiation dose delivered by the GE eXplore 120 microCT non-invasively using Monte Carlo simulations in GATE and to compare results to previously obtained experimental values. Methods: Tungsten X-ray spectra were simulated at 70, 80, and 97 kVp using an analytical tool and their half-value layers were simulated for spectra validation against experimentally measured values of the physical X-ray tube. A Monte Carlo model of the microCT system was set up and four protocols that are regularly applied to live animal scanning were implemented. The computed tomography dose index (CTDI) inside a PMMA phantom was derived and multiple field of view acquisitions were simulated using the PMMA phantom, a representative mouse and rat. Results: Simulated half-value layers agreed with experimentally obtained results within a 7% error window. The CTDI ranged from 20 to 56 mGy and closely matched experimental values. Derived organ doses in mice reached 459 mGy in bones and up to 200 mGy in soft tissue organs using the highest energy protocol. Dose levels in rats were lower due to the increased mass of the animal compared to mice. The uncertainty of all dose simulations was below 14%. Conclusions: Monte Carlo simulations proved a valuable tool to investigate the 3D dose distribution in animals from microCT. Small animals, especially mice (due to their small volume), receive large amounts of radiation from the GE eXplore 120 microCT, which might alter physiological parameters in a longitudinal study setup. [less ▲]

Detailed reference viewed: 39 (3 ULg)
Full Text
Peer Reviewed
See detailMonte-Carlo Tree Search in Backgammon
Van Lishout, François ULg; Chaslot, Guillaume; Uiterwijk, Jos W.H.M.

(2007)

Monte-Carlo Tree Search is a new method which has been applied successfully to many games. However, it has never been tested on two-player perfect-information games with a chance factor. Backgam- mon is ... [more ▼]

Monte-Carlo Tree Search is a new method which has been applied successfully to many games. However, it has never been tested on two-player perfect-information games with a chance factor. Backgam- mon is the reference game of this category. Today’s best Backgammon programs are based on reinforcement learning and are stronger than the best human players. These programs have played millions of offline games to learn to evaluate a position. Our approach consists rather in playing online simulated games to learn how to play correctly in the current position. [less ▲]

Detailed reference viewed: 260 (7 ULg)
Full Text
Peer Reviewed
See detailMonte-Cristo chimiste et physicien des communications : du télégraphe optique au télégraphe électrique
Durand, Pascal ULg

in Cahiers Alexandre Dumas (2014), 41

The modernity of the optical telegraph scene in Le Comte de Monte-Cristo was rather outmoded in 1845. It can be nevertheless viewed as the index of a critical allegory of the technologies of communication ... [more ▼]

The modernity of the optical telegraph scene in Le Comte de Monte-Cristo was rather outmoded in 1845. It can be nevertheless viewed as the index of a critical allegory of the technologies of communication, including the electric telegraph. [less ▲]

Detailed reference viewed: 395 (117 ULg)